Question: what is the unit of length that starts with 'y' and that measures the physical quantity in length.
Paraphrase: what is the unit of length that begins with 'y' and that measures the bodily volume in length.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q1978718 . ?sbj wdt:P111 wd:Q36253 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'y')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: yoctometre, yoctometre, yard, yard, yottametre, yottametre, Yxkast, Yxkast, Yuku, Yuku